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Aromalsp

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**1998**. Alan Guth and his team proposed the inflation theory in

**1980**. The Einstein–Hamilton–Jacobi equation was used by researchers to calculate the rate of cosmic inflation by taking into account the effects of

**dark energy**. Specifically, the equation was used to calculate the rate of inflation of the universe by using the

**density of dark energ**y, its

**pressure**and the

**rate**at which it is

**expanding**.

The

**density and pressure of dark energy**were calculated in

**1998**by physicists

**Michael Turner**and

**Martin White**. They proposed that dark energy is a form of energy that is responsible for the acceleration of the universe's expansion.

NB: The dark energy theory was proposed by Albert Einstein in his paper "Cosmological Considerations of the General Theory of Relativity" in 1917.